JP4153784B2 - Zoom lens barrel - Google Patents

Zoom lens barrel Download PDF

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Publication number
JP4153784B2
JP4153784B2 JP2002358155A JP2002358155A JP4153784B2 JP 4153784 B2 JP4153784 B2 JP 4153784B2 JP 2002358155 A JP2002358155 A JP 2002358155A JP 2002358155 A JP2002358155 A JP 2002358155A JP 4153784 B2 JP4153784 B2 JP 4153784B2
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JP
Japan
Prior art keywords
cam
zoom
diameter portion
cylinder
focus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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JP2002358155A
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Japanese (ja)
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JP2004191558A (en
Inventor
宏明 鈴木
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Hoya Corp
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Hoya Corp
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Publication date
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Priority to JP2002358155A priority Critical patent/JP4153784B2/en
Publication of JP2004191558A publication Critical patent/JP2004191558A/en
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Publication of JP4153784B2 publication Critical patent/JP4153784B2/en
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Description

【0001】
【技術分野】
本発明は、一眼レフカメラ用の交換ズームレンズ鏡筒に関し、特にそのフォーカスカム筒とズームカム筒の支持構造に関する。
【0002】
【従来技術及びその問題点】
一眼レフカメラ用の比較的簡単な構造の交換ズームレンズ鏡筒として、カメラボディに固定される固定筒に独立して回転操作可能にフォーカス操作環とズーム操作環を支持し、さらに、フォーカス操作環と一緒に回動し回動によってフォーカスレンズ群を光軸方向に進退させるフォーカスカム筒と、ズーム操作環と一緒に回動し回動によって変倍レンズ群を光軸方向に進退させるズームカム筒とを設けた鏡筒が知られている。このフォーカスカム筒とズームカム筒は、固定筒にねじ結合する態様と、単に光軸方向の移動を規制して固定筒に支持する態様とがある。
【0003】
後者の態様では従来、フォーカスカム筒とズームカム筒用にそれぞれ光軸方向移動を規制する押さえ環を設ける構成、あるいは、フォーカスカム筒とズームカム筒を当接させ、押さえ環を単一とした構成が知られている。しかし、前者は押さえ環が二つ必要であり、後者はフォーカスカム筒とズームカム筒とが接触しているため、相互に予期せぬ回転を与えてしまうおそれがある。
【0004】
【特許文献】
実開平2-41210号公報
【0005】
【発明の目的】
本発明は、従来のズームレンズ鏡筒についての以上の問題意識に基づき、フォーカスカム筒とズームカム筒の光軸方向の位置規制を単一の押さえ環で行うことができ、しかも、二つのカム筒を当接させることのないズームレンズ鏡筒を得ることを目的としている。
【0006】
【発明の概要】
本発明は、カメラボディに固定される固定筒;この固定筒に独立して回転操作可能に支持されたフォーカス操作環とズーム操作環;上記フォーカス操作環と一緒に回動し、回動によってフォーカスレンズ群を光軸方向に進退させるフォーカスカム筒;及び上記ズーム操作環と一緒に回動し、回動によって変倍レンズ群を光軸方向に進退させるズームカム筒;を有するズームレンズ鏡筒において、上記固定筒に、上記二つのカム筒のいずれか一方を回転自在に支持する大径部と、該大径部の一方の端部に設けた該大径部より大径の第1当接部と、上記二つのカム筒の他方を回転自在に支持する小径部と、この大径部の上記第1当接部と反対側の端部と小径部との間に位置する中径部と、該中径部と小径部を接続する第2当接部とを形成し、この中径部に押さえ環を支持し、上記一方のカム筒の一方の端面が上記第1当接部に当接し、上記他方のカム筒の一方の端部に、上記第2当接部に当接する、径方向に延びる第1フランジを形成し、上記押さえ環が、一方の端面に形成した、上記一方のカム筒の他方の端面に当接する光軸方向位置規制面と、他方の端部に形成した、上記第2当接部との間で上記第1フランジを挟持する、径方向に延びる第2フランジと、を備えることを特徴としている。
【0007】
この構成によると、単一の押さえ環によって両カム筒の光軸方向移動を規制することができる。
【0009】
押さえ環は、中径部にバヨネット結合する態様、あるいは止めねじで固定する態様でもよいが、螺合する態様が最も構造及び組立が簡単である。
【0010】
【発明の実施形態】
図1ないし図3は、本発明によるズームレンズ鏡筒の一実施形態を示している。カメラボディに固定される固定筒10は、外側固定筒11と内側固定筒12を有している。外側固定筒11には、その前部外周にフォーカス操作環13が回転自在に支持され、後方外周にズーム操作環14が回転自在に支持されている。15は、ズーム操作環14の光軸方向移動を規制する抜け止め環である。
【0011】
内側固定筒12は、その前方から順に、1群レンズ固定部12a、大径部12b、中径部12c、小径部12d及びバヨネット部12eを有している。さらに、1群レンズ固定部12aと大径部12bの間は第1当接部12fをなし、中径部12cと小径部12dの間は第2当接部12gをなしている。本実施形態のレンズ系は、物体側から順に、固定レンズ群L1、フォーカスレンズ群L2、変倍レンズ群L3、L4及び固定レンズ群L5を有しており、固定レンズ群L1は1群レンズ固定部12aに固定され、固定レンズ群L5は、小径部12dの後部に固定されている。バヨネット部12eはカメラボディに着脱される。
【0012】
大径部12bの内側には、フォーカスレンズ群L2を固定した2群枠16が位置し、外側には、フォーカスカム筒17が回転自在に位置している。フォーカスカム筒17の前端面は第1当接部12fに当接している。2群枠16から径方向に突出させたフォロアピン16aは、大径部12bに形成した光軸と平行な直進案内溝12b1及びフォーカスカム筒17に形成したカム溝(リード溝)17a(図2参照)に嵌まっている。また、フォーカスカム筒17から径方向に突出させた回転伝達ピン17bは、外側固定筒11に形成した周方向溝11aを通ってフォーカス操作環13の内周面に形成した回転伝達穴13aに嵌まっている。従って、フォーカス操作環13を正逆に回転すると、フォーカスカム筒17が一緒に回動し、直進案内溝12b1に直進案内されている2群枠16(フォーカスレンズ群L2)がカム溝17aに従い光軸方向に進退してフォーカシングがなされる。
【0013】
小径部12dの内側には、前方から順に、変倍レンズ群L3を固定した3群枠18と変倍レンズ群L4を固定した4群枠19が位置し、外側には、ズームカム筒20が回転自在に位置している。ズームカム筒20の前端部に形成した外方フランジ(第1フランジ)20dの前端面は第2当接部12gの後端面に当接している。3群枠18から径方向に突出させたフォロアピン18aは、小径部12dに形成した光軸と平行な直進案内溝12d1及びズームカム筒20に形成したカム溝20a(図3参照)に嵌まっている。同様に、4群枠19から径方向に突出させたフォロアピン19aは、小径部12dに形成した光軸と平行な直進案内溝12d2及びズームカム筒20に形成したカム溝20b(図3参照)に嵌まっている。また、ズームカム筒20から径方向に突出させた回転伝達ピン20cは、外側固定筒11に形成した周方向溝11bを通ってズーム操作環14の内周面に形成した回転伝達穴14aに嵌まっている。従って、ズーム操作環14を正逆に回転すると、ズームカム筒20が一緒に回動し、直進案内溝12d1と直進案内溝12d2に直進案内されている3群枠18(変倍レンズ群L3)と4群枠19(変倍レンズ群L4)がカム溝20aとカム溝20bに従い光軸方向に進退してズーミングがなされる。
【0014】
内側固定筒12の中径部12cには、フォーカスカム筒17とズームカム筒20の光軸方向位置を規制する押さえ環21が螺合されている。この押さえ環21は、前側端面21aが大径部12bと中径部12cの間の段部に当接するように中径部12cに一杯にねじ込んだとき、該前側端面21aがフォーカスカム筒17の後端面に当接する。また、押さえ環21の後端部には、内方フランジ(第2フランジ)21bが形成されていて、この内方フランジ21bがズームカム筒20の前端部に形成した外方フランジ(第1フランジ)20dに係合する。すなわち、前側端面21aはフォーカスカム筒17に係合してその光軸方向位置を規制する光軸方向位置規制面を構成し、内方フランジ21bはズームカム筒20の外方フランジ20dに係合してその光軸方向位置を規制する光軸方向位置規制面を構成している。
【0015】
従って上記構成の本ズームレンズ鏡筒は、フォーカスカム筒17とズームカム筒20の光軸方向の位置規制を押さえ環21単独で行うことができる。フォーカスカム筒17とズームカム筒20は当接していないから、フォーカス操作環13を回動させて行うフォーカシングあるいはズーム操作環14を回動させて行うズーミングの際に、一方の回動が他方の回動に影響を与えることがない。
【0016】
以上の実施形態の内側固定筒12は、大径部12b、中径部12c及び小径部12dが必須であるが、その他の部分の構成には自由度がある。例えば1群レンズ固定部12a(固定レンズ群L1)を省略したズームレンズ系にも本発明は適用可能であり、固定レンズ群L5の支持態様(有無)も問わない。また、以上の実施形態では、フォーカスカム筒17(フォーカス操作環13)を前方に配置し、ズームカム筒20(ズーム操作環14)を後方に配置したが、この前後関係は逆にしてもよい。
【0017】
ちなみに、図4、図5は従来のズームレンズ鏡筒を示している。図4は、フォーカスカム筒17用とズームカム筒20用にそれぞれ押さえ環31と押さえ環32を設けた従来例、図5は、フォーカスカム筒17の後端部にズームカム筒20の前端面に当接する内方フランジ17Xを設けて、単一の押さえ環33を用いた例である。この他の部分は、図1のズームレンズ鏡筒と同一である。
【0018】
【発明の効果】
本発明によれば、フォーカスカム筒とズームカム筒の光軸方向の位置規制を単一の押さえ環で行うことができ、しかも、二つのカム筒を当接させることのないズームレンズ鏡筒を得ることができる。
【図面の簡単な説明】
【図1】 本発明によるズームレンズ鏡筒の一実施形態を示す上半縦断面図である。
【図2】 図1のII矢視展開図である。
【図3】 図1のIII矢視展開図である。
【図4】 従来のズームレンズ鏡筒の例を示す上半断面図である。
【図5】 従来のズームレンズ鏡筒の他の例を示す上半断面図である。
【符号の説明】
L1 固定レンズ群
L2 フォーカスレンズ群
L3 変倍レンズ群
L4 変倍レンズ群
L5 固定レンズ群
10 固定筒
11 外側固定筒(固定筒)
11a 周方向溝
11b 周方向溝
12 内側固定筒(固定筒)
12a 1群レンズ固定部
12b 大径部
12b1 直進案内溝
12c 中径部
12d 小径部
12d1 直進案内溝
12d2 直進案内溝
12e バヨネット部
12f 第1当接部
12g 第2当接部
13 フォーカス操作環
13a 回転伝達穴
14 ズーム操作環
14a 回転伝達穴
16 2群枠
17 フォーカスカム筒
18 3群枠
19 4群枠
20 ズームカム筒
20a カム溝
20b カム溝
20c 回転伝達ピン
20d 外方フランジ(第1フランジ)
21 押さえ環
21b 内方フランジ(第2フランジ)
[0001]
【Technical field】
The present invention relates to an interchangeable zoom lens barrel for a single-lens reflex camera, and more particularly, to a support structure for the focus cam barrel and the zoom cam barrel.
[0002]
[Prior art and its problems]
As an interchangeable zoom lens barrel with a relatively simple structure for a single-lens reflex camera, it supports a focus operation ring and a zoom operation ring that can be rotated independently of a fixed cylinder fixed to the camera body. A focus cam cylinder that rotates together with the zoom lens to advance and retract the focus lens group in the optical axis direction, and a zoom cam cylinder that rotates together with the zoom operation ring and advances and retracts the variable magnification lens group in the optical axis direction by rotation. A lens barrel provided with is known. The focus cam cylinder and the zoom cam cylinder have a mode in which they are screw-coupled to the fixed cylinder and a mode in which the movement in the optical axis direction is simply restricted and supported by the fixed cylinder.
[0003]
In the latter mode, conventionally, there is a configuration in which a pressing ring for restricting movement in the optical axis direction is provided for each of the focus cam barrel and the zoom cam barrel, or a configuration in which the focusing cam barrel and the zoom cam barrel are brought into contact with each other so that the pressing ring is single. Are known. However, the former requires two holding rings, and the latter is in contact with the focus cam barrel and the zoom cam barrel, which may cause unexpected rotation of each other.
[0004]
[Patent Literature]
Japanese Utility Model Publication No. 2-41210 [0005]
OBJECT OF THE INVENTION
The present invention is based on the above problem awareness of the conventional zoom lens barrel, and can control the position of the focus cam barrel and the zoom cam barrel in the optical axis direction with a single press ring. An object of the present invention is to obtain a zoom lens barrel that does not abut.
[0006]
SUMMARY OF THE INVENTION
The present invention relates to a fixed cylinder fixed to a camera body; a focus operation ring and a zoom operation ring that are supported so as to be independently rotatable by the fixed cylinder; and rotates together with the focus operation ring. A zoom lens barrel having: a focus cam barrel that advances and retracts the lens group in the optical axis direction; and a zoom cam barrel that rotates together with the zoom operation ring and advances and retracts the variable power lens group in the optical axis direction by rotation. A large-diameter portion that rotatably supports one of the two cam cylinders on the fixed cylinder, and a first abutting section having a larger diameter than the large-diameter section provided at one end of the large-diameter section When the diameter in which is located between a small diameter portion which rotatably supports the other of the two cam tube, the end portion and the small diameter portion opposite to said first contact portion of the large diameter portion, and a second contact portion which connects the middle diameter portion and a small diameter portion formed, this Supporting the ring retainer in diameter, one end face of one of the cam cylinder above is brought into contact with the first contact portion, at one end of the other of the cam barrel, abuts on the second abutting portion A first flange extending in the radial direction is formed, and the pressing ring is formed on one end face, and is formed on the other end face of the one cam cylinder and on the other end. And a second flange extending in the radial direction that sandwiches the first flange with the second contact portion .
[0007]
According to this configuration, the movement of the both cam cylinders in the optical axis direction can be restricted by a single pressing ring.
[0009]
The press ring may be in the form of being bayonet-coupled to the middle diameter part or fixed with a set screw, but the form of screwing is the simplest in structure and assembly.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3 show an embodiment of a zoom lens barrel according to the present invention. The fixed cylinder 10 fixed to the camera body has an outer fixed cylinder 11 and an inner fixed cylinder 12. A focus operation ring 13 is rotatably supported on the outer periphery of the outer fixed cylinder 11 and a zoom operation ring 14 is rotatably supported on the rear outer periphery. Reference numeral 15 denotes a retaining ring that restricts movement of the zoom operation ring 14 in the optical axis direction.
[0011]
The inner fixed cylinder 12 includes a first lens group fixing portion 12a, a large diameter portion 12b, a medium diameter portion 12c, a small diameter portion 12d, and a bayonet portion 12e in order from the front. Further, a first contact portion 12f is formed between the first lens group fixing portion 12a and the large diameter portion 12b, and a second contact portion 12g is formed between the medium diameter portion 12c and the small diameter portion 12d. The lens system of the present embodiment includes, in order from the object side, a fixed lens group L1, a focus lens group L2, a variable power lens group L3, L4, and a fixed lens group L5. The fixed lens group L1 is fixed to the first group lens. The fixed lens unit L5 is fixed to the portion 12a, and is fixed to the rear portion of the small diameter portion 12d. The bayonet part 12e is attached to and detached from the camera body.
[0012]
A second group frame 16 to which the focus lens group L2 is fixed is positioned inside the large diameter portion 12b , and a focus cam cylinder 17 is rotatably positioned outside. The front end surface of the focus cam cylinder 17 is in contact with the first contact portion 12f. The follower pin 16a protruded from the second group frame 16 in the radial direction includes a straight guide groove 12b1 parallel to the optical axis formed in the large diameter portion 12b and a cam groove (lead groove) 17a formed in the focus cam cylinder 17 (see FIG. 2). ). Further, the rotation transmission pin 17b protruded in the radial direction from the focus cam cylinder 17 is fitted into a rotation transmission hole 13a formed in the inner peripheral surface of the focus operation ring 13 through a circumferential groove 11a formed in the outer fixed cylinder 11. waiting. Accordingly, when the focus operation ring 13 is rotated in the forward and reverse directions, the focus cam cylinder 17 is rotated together, and the second group frame 16 (focus lens group L2) guided in the straight advance guide groove 12b1 is guided by the cam groove 17a. Focusing is performed by moving back and forth in the axial direction.
[0013]
Inside the small-diameter portion 12d, a third group frame 18 to which the variable power lens unit L3 is fixed and a fourth group frame 19 to which the variable power lens unit L4 are fixed are located in order from the front, and the zoom cam cylinder 20 is rotated to the outside. It is located freely. The front end surface of the outer flange (first flange) 20d formed at the front end portion of the zoom cam cylinder 20 is in contact with the rear end surface of the second contact portion 12g. The follower pin 18a protruded in the radial direction from the third group frame 18 is fitted into a straight guide groove 12d1 parallel to the optical axis formed in the small diameter portion 12d and a cam groove 20a (see FIG. 3) formed in the zoom cam barrel 20. . Similarly, the follower pin 19a protruded in the radial direction from the fourth group frame 19 is fitted into a rectilinear guide groove 12d2 parallel to the optical axis formed in the small diameter portion 12d and a cam groove 20b (see FIG. 3) formed in the zoom cam barrel 20. waiting. Further, the rotation transmission pin 20 c projected from the zoom cam cylinder 20 in the radial direction is fitted into a rotation transmission hole 14 a formed on the inner peripheral surface of the zoom operation ring 14 through a circumferential groove 11 b formed in the outer fixed cylinder 11. ing. Accordingly, when the zoom operation ring 14 is rotated in the forward and reverse directions, the zoom cam barrel 20 is rotated together, and the third group frame 18 (variable magnification lens group L3) guided in the straight direction by the straight guide groove 12d1 and the straight guide groove 12d2. The fourth group frame 19 (variable magnification lens group L4) is moved forward and backward in the optical axis direction according to the cam groove 20a and the cam groove 20b to perform zooming.
[0014]
A pressing ring 21 that regulates the position of the focus cam cylinder 17 and the zoom cam cylinder 20 in the optical axis direction is screwed into the middle diameter portion 12 c of the inner fixed cylinder 12. When the front end surface 21a is fully screwed into the middle diameter portion 12c so that the front end surface 21a contacts the step portion between the large diameter portion 12b and the middle diameter portion 12c, the front end surface 21a It contacts the rear end face. Further, an inner flange (second flange) 21 b is formed at the rear end portion of the presser ring 21, and an outer flange (first flange) formed at the front end portion of the zoom cam barrel 20 by this inner flange 21 b. Engage with 20d. That is, the front end face 21 a constitutes an optical axis direction position regulating surface that engages with the focus cam cylinder 17 and regulates its optical axis direction position, and the inner flange 21 b engages with the outer flange 20 d of the zoom cam cylinder 20. An optical axis direction position regulating surface for regulating the position in the optical axis direction is configured .
[0015]
Therefore, the zoom lens barrel having the above-described configuration can restrict the position of the focus cam barrel 17 and the zoom cam barrel 20 in the optical axis direction by the pressing ring 21 alone. Since the focus cam cylinder 17 and the zoom cam cylinder 20 are not in contact with each other, in the focusing performed by rotating the focus operation ring 13 or the zooming performed by rotating the zoom operation ring 14, one rotation is performed in the other direction. Does not affect movement.
[0016]
The inner fixed cylinder 12 of the above embodiment has the large-diameter portion 12b , the medium-diameter portion 12c, and the small-diameter portion 12d, but there is a degree of freedom in the configuration of the other portions. For example, the present invention can be applied to a zoom lens system in which the first group lens fixing portion 12a (fixed lens group L1) is omitted, and the support mode (presence / absence) of the fixed lens group L5 is not limited. Further, in the above embodiment, the focus cam cylinder 17 (focus operation ring 13) is disposed in the front and the zoom cam cylinder 20 (zoom operation ring 14) is disposed in the rear. However, the front-rear relationship may be reversed.
[0017]
4 and 5 show a conventional zoom lens barrel. 4 shows a conventional example in which a holding ring 31 and a holding ring 32 are provided for the focus cam cylinder 17 and the zoom cam cylinder 20, respectively, and FIG. 5 shows the front end surface of the zoom cam cylinder 20 at the rear end of the focus cam cylinder 17. This is an example in which an inner flange 17X that is in contact is provided and a single retaining ring 33 is used. Other parts are the same as those of the zoom lens barrel of FIG.
[0018]
【The invention's effect】
According to the present invention, a zoom lens barrel can be obtained in which the position of the focus cam barrel and the zoom cam barrel in the optical axis direction can be regulated with a single press ring, and the two cam barrels are not brought into contact with each other. be able to.
[Brief description of the drawings]
FIG. 1 is an upper half longitudinal sectional view showing an embodiment of a zoom lens barrel according to the present invention.
FIG. 2 is a development view taken along the arrow II in FIG. 1;
FIG. 3 is a development view taken along arrow III in FIG. 1;
FIG. 4 is an upper half sectional view showing an example of a conventional zoom lens barrel.
FIG. 5 is an upper half sectional view showing another example of a conventional zoom lens barrel.
[Explanation of symbols]
L1 fixed lens group L2 focus lens group L3 variable magnification lens group L4 variable magnification lens group L5 fixed lens group 10 fixed cylinder 11 outer fixed cylinder (fixed cylinder)
11a circumferential groove 11b circumferential groove 12 inner fixed cylinder (fixed cylinder)
12a First lens group fixing portion 12b Large diameter portion 12b1 Straight guide groove 12c Medium diameter portion 12d Small diameter portion 12d1 Straight guide groove 12d2 Straight guide groove 12e Bayonet portion
12f 1st contact part
12g 2nd contact part 13 Focus operation ring 13a Rotation transmission hole 14 Zoom operation ring 14a Rotation transmission hole 16 2nd group frame 17 Focus cam cylinder 18 3rd group frame 19 4th group frame 20 Zoom cam cylinder 20a Cam groove 20b Cam groove 20c Rotation transmission Pin 20d Outer flange (first flange)
21 Retaining ring
21b Inner flange (second flange)

Claims (2)

カメラボディに固定される固定筒;
この固定筒に独立して回転操作可能に支持されたフォーカス操作環とズーム操作環;
上記フォーカス操作環と一緒に回動し、回動によってフォーカスレンズ群を光軸方向に進退させるフォーカスカム筒;及び
上記ズーム操作環と一緒に回動し、回動によって変倍レンズ群を光軸方向に進退させるズームカム筒;
を有するズームレンズ鏡筒において、
上記固定筒に、上記二つのカム筒のいずれか一方を回転自在に支持する大径部と、該大径部の一方の端部に設けた該大径部より大径の第1当接部と、上記二つのカム筒の他方を回転自在に支持する小径部と、この大径部の上記第1当接部と反対側の端部と小径部との間に位置する中径部と、該中径部と小径部を接続する第2当接部とを形成し、
この中径部に押さえ環を支持し、
上記一方のカム筒の一方の端面が上記第1当接部に当接し、
上記他方のカム筒の一方の端部に、上記第2当接部に当接する、径方向に延びる第1フランジを形成し、
上記押さえ環が、一方の端面に形成した、上記一方のカム筒の他方の端面に当接する光軸方向位置規制面と、他方の端部に形成した、上記第2当接部との間で上記第1フランジを挟持する、径方向に延びる第2フランジと、を備えることを特徴とするズームレンズ鏡筒。
A fixed cylinder fixed to the camera body;
A focus operation ring and a zoom operation ring supported by the fixed cylinder so as to be independently rotatable.
A focus cam cylinder that rotates together with the focus operation ring and moves the focus lens group forward and backward in the optical axis direction by rotation; and a zoom cam ring that rotates together with the zoom operation ring and rotates the zoom lens group to the optical axis Zoom cam barrel that advances and retracts in the direction;
In a zoom lens barrel having
A large-diameter portion that rotatably supports one of the two cam cylinders on the fixed cylinder, and a first abutting section having a larger diameter than the large-diameter section provided at one end of the large-diameter section When the diameter in which is located between a small diameter portion which rotatably supports the other of the two cam tube, the end portion and the small diameter portion opposite to said first contact portion of the large diameter portion, Forming a second abutting portion connecting the medium diameter portion and the small diameter portion ;
Support the press ring on this medium diameter part ,
One end surface of the one cam cylinder contacts the first contact portion,
Forming a first flange extending in a radial direction in contact with the second contact portion at one end of the other cam cylinder;
The holding ring is formed between one optical axis position regulating surface formed on one end surface and contacting the other end surface of the one cam cylinder, and the second contact portion formed on the other end. A zoom lens barrel , comprising: a second flange extending in a radial direction that sandwiches the first flange .
請求項1記載のズームレンズ鏡筒において、上記押さえ環は上記中径部に螺合されているズームレンズ鏡筒。 2. The zoom lens barrel according to claim 1, wherein the holding ring is screwed into the middle diameter portion.
JP2002358155A 2002-12-10 2002-12-10 Zoom lens barrel Expired - Fee Related JP4153784B2 (en)

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JP4153784B2 true JP4153784B2 (en) 2008-09-24

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Publication number Priority date Publication date Assignee Title
JP5831158B2 (en) * 2011-11-18 2015-12-09 リコーイメージング株式会社 General purpose interchangeable lens

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